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Effect of ethylene-vinyl acetate copolymer on the rheological behaviour of alumino-silicate/polyethylene wax suspensions

Attarian, M ; Sharif University of Technology | 2002

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  1. Type of Document: Article
  2. DOI: 10.1016/S0272-8842(02)00003-2
  3. Publisher: 2002
  4. Abstract:
  5. Ceramic suspensions were prepared from an alumino-silicate powder, polyethylene wax (PE-wax) as binder with additions of stearic acid (SA). The ceramic powder consisted of mullite, corundum and tridymite phases. The organic binders contained 3 to 8 wt.% ethylene-vinyl acetate (EVA) and were filled with various volume fractions of ceramic powder. The yield stresses of suspensions were estimated using shear stress-shear rate data measured at 90-120 °C. The addition level of EVA was shown to have a considerable effect on the yield stress of suspensions. The effect of EVA on the flow parameters was also investigated over the temperature range of 90 to 120 °C. It was shown that the addition of 5 wt.% EVA in organic binder causes a decrease of viscosity at a temperature of 90 °C and the higher the volume fraction of ceramic powder, the higher the efficiency of EVA in reducing the viscosity. But at higher temperature, EVA acts as a flow modifier rather than increasing the wettability of polymer blend. In fact at this temperature the polymer-particle interaction weakens with EVA content. Moreover, it was found that the required amount of EVA depends on the degree of powder agglomeration. © 2002 Elsevier science Ltd and Techna S.r.l. All rights reserved
  6. Keywords:
  7. A. Injection moulding ; Alumino-silicate ; Ethylene vinyl acetate ; Polyethylene wax ; Rheology
  8. Source: Ceramics International ; Volume 28, Issue 5 , 2002 , Pages 507-514 ; 02728842 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0272884202000032